createdBy in Legacy tcwebservice user

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When you create a challenge in v5, it is initially created in legacy via v4 challenge api. This marks the create_user in legacy as the tcwebservice user because that's what the API uses to create the user.

Since we're overriding pretty much everything immediately after create, can you pull the createdBy from v5 and write it to the projects.create_user. Catch is that you have to convert handle to member ID using the v5 member api.